کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7962406 | 1513985 | 2019 | 25 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A robust sulfur host with dual lithium polysulfide immobilization mechanism for long cycle life and high capacity Li-S batteries
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
فناوری سوخت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Beyond the physical lithium polysulfide (Li2Sx) entrapment of various 3D porous sulfur hosts, the importance of chemical interactions between sulfur host and Li2Sx on performance of Li-S batteries has recently been highlighted. However, most of these studies focus mainly on one type of chemical interaction and effective suppression of Li2Sx migration is still lacking. Here, we report a uniquely designed sulfur host that can immobilize Li2Sx through a dual chemisorption mechanism. The new sulfur host is consisted of an MXene matrix and polydopamine (PDA) overcoat, where Mxene forms a strong Ti-S bonding by the Lewis acid-base mechanism while PDA withholds Li2Sx through the polar-polar interaction. Benefited from the double chemisorption, the new cathode with a high sulfur loading of 5â¯mgâ¯cmâ2 has been demonstrated with an initial capacity of 1001â¯mAâ¯hâ¯gâ1 at a capacity retention of 65% over 1000 cycles at 0.2â¯C. Overall, this study not only presents a unique chemical mechanism to entrap Li2Sx, but also provides a new way to rationally design a practical sulfur cathode for high-performance Li-S batteries.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy Storage Materials - Volume 16, January 2019, Pages 344-353
Journal: Energy Storage Materials - Volume 16, January 2019, Pages 344-353
نویسندگان
Xiwen Wang, Chenghao Yang, Xunhui Xiong, Guilin Chen, Mingzhi Huang, Jeng-Han Wang, Yong Liu, Meilin Liu, Kevin Huang,